Study on the Flow Behavior in a Dump Diffuser

The paper presents the cold flow measurements in a two-dimensional dump diffuser. The laser Doppler velocimeter was used for the measurements of mean velocity components and its fluctuation in order to clarify the flow regimes in a sudden expansion region. Wall friction velocity on the outer wall wa...

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Bibliographic Details
Published inNihon Kikai Gakkai rombunshuu. B hen Vol. 57; no. 544; pp. 4029 - 4035
Main Authors SATO, Atsushi, SHIZAWA, Takaaki, HONAMI, Shinji
Format Journal Article
LanguageEnglish
Japanese
Published The Japan Society of Mechanical Engineers 1991
Subjects
diffusers
flow measurement
fluid mechanics
laser Doppler velocimetry
Reattachment
turbulence
vortices
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Summary:The paper presents the cold flow measurements in a two-dimensional dump diffuser. The laser Doppler velocimeter was used for the measurements of mean velocity components and its fluctuation in order to clarify the flow regimes in a sudden expansion region. Wall friction velocity on the outer wall was also measured by a wall flow sensor. The rolling up of flow from the outer wall is observed in a sudden expansion region near the reattachment point. Such behavior contributes to the favorable characteristics on the flow rate distribution to the branched channels, while it produces turbulence energy which causes a large pressure loss in the dump diffuser. Wall friction velocity and its fluctuation in a sudden expansion region decrease toward the base of the prediffuser.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0387-5016
1884-8346
DOI:10.1299/kikaib.57.4029